Spring mounting



July 16, 1935. G. SPILLER SPRING MOUNTING Filed uarch 14, 1954 INVENTIJR, f/FHARD SI /UHF. 7%

A TTORNEYI Patented July 1c, 1935 2,008,475

UNITED STATES PATENT OFFICE Bendix Aviation Corporation, South Bend, Ind., a corporation of Delaware Application March 14, 1934, Serial No. 715,569

4; Claims. (01. 33-2 22) The present invention relates to spring mountacters refer to like parts throughout the several ings for instruments, particularly forthe indiviews,

eating or recording elements of indicators and/or Fig. 1 is a front elevation, partly in section,

recorders. of one embodiment of the invention shown ap- One of the objects of the invention is to proplied to a card of a magnetic compass; 5

vide a novel support for an element such as a Fig. 2 is a similar view of a like embodiment compass card of a magnetic compass or a reas applied to a recorder;

cording. pen or pencil of a recorder,-for exam- Fig. 3 is a partialview in section of another pie, whereby vibrations in a vertical plane are embodiment shown applied to a compass card;

prevented from being transmitted to such an ele- Fig. 4 is a detailed perspective view of the em- 10 ment. bodiment shown in Fig. 3; and

,Another object is to provide, in combination Fig. 5 is a detailed view of another embodiwith a compass card having a pivot pin mounted ment which may be applied to a compass card on a vertically supported bearing, novel means or to a recorder.

for preventing transmission of vertical vibrations Referring to the drawing, and more particular- 15 to. the card particularly when the compass is 1y to-Fig. 1, the invention is shown in one form mounted on an aircraft, said means serving also applied to a compass card 6 which has suspended as the sole support for the card on the pivot pin. therefrom a pair of magnets 1 and 8 by means of A further object is to provide a novel spring members 9 and II carried by the card. The card mounting for a compass card having'apivot pin is adapted to be carried on pivot post II at the 20 or for a recording pen of arecorder, whereby top of which is provided a cup-shaped jewel vertical vibrations of the card or pen arm are bearing l2 into which a pivot pin I3 is adapted to prevented and whereby the pivot pin or recordbe inserted. Secured to the card 6 is a guard ing pen may be readily removed from the mountmember I to prevent displacement of the pivot ing forinspection or replacement thereof. pin I 3 from the'bearing' l2. Means are now pro- 25 Still another object is to provide a novel shockvided for resiliently supporting the card 6 on the absorbing spring for sensitive elements of delibearing I2 in order to prevent vertical'vibrations cate instruments, as for .a compass card of a from being transmitted to the card from the compass or for a recording pen of a recorder, pivot post ll, particularly when the compass-in" i and comprising a strip of spring material bent which the card is embodied is carried on a ve- 30 .up so that its ends come substantially adjacent hicle .such as an airplane which is subject to each other in a horizontal plane and are secured engine vibrations. In the form shown, said to the card orto the pen arm, either directly means comprise aspring i5 whichis formed from or indirectly, and so that the body of the spring a strip of. spring material and bent up so that the extends upwardly from each end to form a reends I and I1 thereof are substantially adjacent 35 silient bridge between the upwardly extending each otherinahorizontal plane but not'completeportions and substantially parallel to the plane ly abutting each other and so that the body of the of the adjacent ends whereby a pivot pin or respring extends upwardly from the ends it and I1, cording pen may be inserted to project upwardly as shown at l8 and I, to form a resilient bridge 40 between the adjacent ends of the spring and bear 1 20 between the upwardly extending portions 40 against the bridge, thus providing a .resilient and I9 and substantially parallel to the plane of abutment for the pin or pen. the ends l8 and I1 whereby the pivot pin I! may The above and other objects and advantages project upwardly between the adjacent ends it of the invention will appear more fully hereand ll of the spring so as to bear against the .inafter from a consideration of the. detailed debridge 20, thus providing a resilient abutment 45 scription which follows, taken together with the for said pivot pin. Substantially mid-way beaccompanying drawing wherein two embodiments tween the ends of the bridge 20 thereis provided and two applications of the invention are illusan indentation 2| whereby the pivot pin it may trated. It is. to be expres y un tood, however. be readily centered with respect thereto and the that the drawin is f r the purp s of illustra upper end of which is adaptedtobe seated there- 50 tion and description only and is not to be conin, In order to provide for variation in the strued as defining the limits of the invention, resiliency of the bridge 20, the upwardly extendreference being had to the appended claims for ing portions l8 and IQmaybebent downwardly to this purpose. form loops 22 and 23 before the bridge 20 is In the drawing wherein like reference cha'rformed. By bending the loops 22 and 23 toward 55 portion or head 24 of a hollow, preferably cylindrical, member 25'thro'ugh which the pin 13 is adapted to extend and which is pressed into a hollow cylindrical portion 26 secured to or formed integrally with the guard l4. Thus by the rigid,

connection between the tubular member 25 and the tubular portion 26 and by the connection of the ends l6 and H of thespring to the head 24, the resilient spring mounting thus formed be-. comes an integral part of the compass card 6. The pivot pin I3 is provided with anenlarged head 21 to prevent it from passing through the tubular member 25 but which is adapted to move freely within said member. Thus it will be seen that as the pivot pin 13 rests on the jewel bearing i2 it supports the entire compass card structure by means of the novel spring H5 at the in- -dentation"2l formed in the bridge 20/ Consequently, any vibration of the pivot post II in a vertical direction is absorbed through the pivot pin -l3 by the bridge 20 of thesprin'g. If it be desired to replace the pivot pin l3, all that is necessary is to lift the bridge 2Q slightly and move it a little to one sideor'the other of the pin thereby making the latter accessible for removal from the tubular member 25.

Referring to Fig. atuere is shown an embodi ment of the, invention likethat in Fig. 1 but ap-' applied to a recording instrument consisting generally of some sensitive element (not shown) responsive to changes in conditions and'enclosed in a housing 28and having a recording pen arm 29 projecting from said housing 28; The end of the pen; arm 29 is provided with a vertical tubular portion 30 into which the tubular member 25 of the novel spring mounting is inserted and to which it is secured. Within the tubular member 25 is guided a recording pen 3| the upper end of which abuts against the bridge 20 in the same manner as the pivot pin l3 of the compass card shown in Fig. 1. The pin cooperates with a recording chart 32 carried by a drum 33 which is rotatable about its axis 34 by some suitable mechanism such, for example, as a clock work (not shown) whereby a time record may be obtained on the chart 32 of the changes of the conditions 'as'determined by the sensitive element located within the housing 28. The entire recording mechanism is carried on a suitable panel 34 and thus any vibration of the panel which may be transmitted to the drum 33 is prevented from being transmitted back to the recording pen arm 29 through the pen 3| by means of the bridge 20 of the novel spring mounting.

Referring to Fig. 3, there is shown an embodiment similar to that shown in Fig. 1 except that the ends l6 andlfl of the spring l5 are connected directly to the tubular portion 26 of the guide H which is carried by the compass card 6.

If desired, the loops 22 and 23 of the spring l5. as shown in Figs. 1,2, 3 and 4 may be dispensed with and the spring may take the form shown in 'Fig. 5 wherein the bridge 20 extends directly across the upwardly extending portions I 8 and I9, the latter being slightly shorter than as shown in Figs. 1, 2, 3 and 4.

There is thus provided a novel resilient mounting for sensitive elements of delicate instruments, which is relatively simple and inexpensive and which consists of a small strip of spring material bent up in a novel manner to provide a resilient support whereby vertical vibrations are absorbed by the spring and prevented from being transmitted to the element with which they are associated.

Although only two embodiments of the invention havebeen illustrated and described-other changes in the shape and form of the spring, which will now appear to those skilled in the art, may be made without departing from the scope of the invention. Reference is, therefore, to be had to the appended claims for a definition of the limits of the invention.

What is claimed is:

1. A spring mounting comprising a tubular member, a strip of spring material bent down so that its ends are substantially adjacent each other in a horizontal plane and secured to the tubular member at diametrically opposite sides of its upper end and so that the body of the strip extends upwardly from each of its ends to form a resilient bridge between said'upwardly extending portions and substantially parallel to theplane of the adjacent ends, and an elongated member extending slidably through the tubular member and having its upper end abutting the resilient bridge'of the strip whereby said strip constitutes a shock absorber for any device which may be connected to the tubular member.

' 2. 'A spring mounting for a compass card, comprising a tubular member adapted to be secured to-the center of the card perpendicularly to the plane of the card, a strip of spring material bent down so that its ends are substantially adjacent each other in a horizontal plane and secured to the tubular member at opposite sides thereof and so that the body of the strip extends upwardly from each of its ends to form a resilient bridge between the upwardly extending portions, and a pivot pin on which the card is adapted to be supported, said pin extending slidably through said tubular member and having itsupper end abutting the resilient bridge of the strip.

3. A spring mounting for a compass card, comprising an elongated hollow member adapted to be secured to the center of the card perpendicularly to the plane of said card, a strip of spring material bent down so that its ends are substantially adjacent each other in a horizontal plane and secured to the hollow member on opposite sides thereof and so that the body of the strip extends upwardly from each. of its ends to form a resilient bridge over one end of the hollow member and between the upwardly extending portions, and a pivot pin on which the card is adapted to be supported, said bridge having an indentation substantially mid-way between the upwardly extending portions and constituting a centering guide for the pin, the latter extending upwardly through the hollow member and having its upper end abutting the resilient bridge of the strip at said indentation.

4. A spring mounting for a compass card, comprising a pivot passing through the center of the card and adapted for relative longitudinal movement with respect to said card, and a'substantialiy fiat spring having its ends bent upon itself and anchored on opposite sides of the opening from which said pivot projects so that the body of the spring is disposed over and on the upper end of said pivot whereby said spring constitutes the sole support for the card on said pivot.

GERHARD SPILLER. 

